Artificial tooth and backing.



P.' MORRISDN, 0F MOUNT ABJMEL, PENNSYLVANIA.

ARTEIGIAL Tl AND BCKNG.

2"'k 'fwwmzmoy cof/zoem" isi-'mii that i., JOSEPH P. MORRISON, en of: the United States, residing et met oe-culle? pressures and. on these-teeth in the pzocadapting the teeth to he appli'cl to plate, Crowe; and hrigeo'ofl with ease and facility and ie iotez'changeohle manner, so that ele.- l tooth may he easily removed and miofberinsered; itsplece, the-constuce enable et :a tooth iee oit' strength enel the teinture Withthe .tzoht. e cte in the ieotules o' 'on and' arrange- ;uliy heicinefte, flee'erencebeing hed scemo y tiia'winge, wherein-- Fimo l is o side elevation oit orticiel ne* embodying hij/ invention; cel longitudinal seetion of 3. is hoiizontal transverse Teer pei'spective vieWPo #el hashing; mtl .tive o1" the heel-:i c?, ctviojy l "esignetee the As hewo; e this tooth ortica-l amitinelly of the eofizontel transverse fregi, et right eo- ;igy a time llt will he "peeeetoza of tteis Patent.

x .l @legate-e ier serial No. 43,958.

the backing in e novel manner, es hereinafter described. y

The. body 1 is formed with one or more pin-receiving sockets or recesses 4c, two being' shown in the piesent instance, arranged on opposite sides of the longitudinal center of the tooth. These sockets or recesses intel'- Seot at their upper ends theehoulder 3 et its point of juncture with the fece 2, and

thence extehd downward-and forwod at an ongle in e direction towafcl the biting edge of the tooth.

hooking 5,V for use in connection with the tooth, comprises :t gold of other metallic plete ot the same superficiel :L1-ee, as the lingual surface of' the tooth and;

having Trib or ohset 6 formeel uoon the huocel surface thereof and adopteV to e:o-v

the recesses and the lingual sui-fece of the tooth cemented to the buco-ol surface of the hedging, es `-will he eodily understood.

.it will be ohservedfroio the foregoing description that hy reason of the construef tion described the tooth is rehclered detachvable and mteohengealole, so that m event of injury to one tooth another may be substituted hy removing'the injuzecl tooth and applying a new one to the backlog. Also,

Yit will he seen. that e firm fastening between the tooth backing is secured 'Without eX- posme of the hooking from the front of the tooth. Moreovei', it will he seen that es the lippe? and lower portions of the lmgoeleux-face oft tooth hotlya es weil lthe ehoulileir: 3, me stieight or plane soifeeeei, Wijf the slooulfiei' oirengefl substantially iight eogles to the lingual soiiieee of the ,tooth hoc y, the abutment surfaces et the tooth enel haci-:ing ere edepted to interlock invsueh e manner as to give the tooth firm support during' the pioeess of mestication, in which the tooth is subjected to direct Vel'- tieel cutting strains, as Well es lateral strains of e kind tending to pull the tooth away from its backing. By making the abutting'surfaces-straight, .ami hy particularly arranging the shoulder and h of the ing the tooth and backing of objectionable thickness.

The present construction adapts the tooth to be made comparatively thin and the backing correspondingly thin, so that strength and durability Will be secured without the tooth being made cumbersome or the backing` showing at the front. The present construction also adapts the backing to be exn tended substantially the full length of the tooth, namely, from the shoulder 3 to the gingival surface, and also and particularly from the shoulder 3 to the occlusal or biting surface, so that a strong backing for the tooth and anchorage to the bridge work may be obtained under all conditions.

I claim as my invention An articial tooth facing comprising' a body having its lingual surface provided with a substantially medial horizontal transV verse shoulder, an abutment surface leading from the inner edge of said shoulder toward the gingival surface of the tooth, anabutment surface leading at an angle from the outer edge of the shoulder to the occlusal surface 4of the tooth, said body being provided with pin-receiving recesses opening through said shoulder, and a backing provided with `a corresponding shoulder and y vabutment surfaces to engage the shoulder and abutment surfaces of the body and having pins projecting from its shoulder to engage said pin-receiving recesses.

In testimony whereof I aHiX my signature in the presence .of two Witnesses.

JOSEPH. P. MORRISON.

Witnesses:

DAVID M.,HUGH ES, L. D. BECKER. 

